<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="./js/ctx.js"></script>
</head>
<body>
<div id="cesiumContainer"></div>
<div id="toolbar">
    <div id="interpolationMenu"></div>
</div>
<script>
    var initCesium = new InitCesium();
    var viewer = initCesium.initViewer('cesiumContainer',{
        animation: true,
        timeline: true,
        infoBox: false, //Disable InfoBox widget
        selectionIndicator: false, //Disable selection indicator
        shouldAnimate: true, // Enable animations
        terrainProvider: Cesium.createWorldTerrain()
    });

    //Enable lighting based on sun/moon positions
    viewer.scene.globe.enableLighting = true;

    //Enable depth testing so things behind the terrain disappear.
    viewer.scene.globe.depthTestAgainstTerrain = true;

    //Set the random number seed for consistent results.
    Cesium.Math.setRandomNumberSeed(3);

    //Set bounds of our simulation time
    var start = Cesium.JulianDate.fromDate(new Date(2015, 2, 25, 16));
    var stop = Cesium.JulianDate.addSeconds(start, 360, new Cesium.JulianDate());

    //Make sure viewer is at the desired time.
    viewer.clock.startTime = start.clone();
    viewer.clock.stopTime = stop.clone();
    viewer.clock.currentTime = start.clone();
    viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP; //Loop at the end
    viewer.clock.multiplier = 10;

    //Set timeline to simulation bounds
    viewer.timeline.zoomTo(start, stop);

    //Generate a random circular pattern with varying heights.
    function computeCirclularFlight(lon, lat, radius) {
        var property = new Cesium.SampledPositionProperty();
        for (var i = 0; i <= 360; i += 45) {
            var radians = Cesium.Math.toRadians(i);
            var time = Cesium.JulianDate.addSeconds(start, i, new Cesium.JulianDate());
            var position = Cesium.Cartesian3.fromDegrees(lon + (radius * 1.5 * Math.cos(radians)), lat + (radius * Math.sin(radians)), Cesium.Math.nextRandomNumber() * 500 + 1750);
            property.addSample(time, position);

            //Also create a point for each sample we generate.
            viewer.entities.add({
                position : position,
                point : {
                    pixelSize : 8,
                    color : Cesium.Color.TRANSPARENT,
                    outlineColor : Cesium.Color.YELLOW,
                    outlineWidth : 3
                }
            });
        }
        return property;
    }

    //Compute the entity position property.
    var position = computeCirclularFlight(-112.110693, 36.0994841, 0.03);

    //Actually create the entity
    var entity = viewer.entities.add({

        //Set the entity availability to the same interval as the simulation time.
        availability : new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({
            start : start,
            stop : stop
        })]),

        //Use our computed positions
        position : position,

        //Automatically compute orientation based on position movement.
        orientation : new Cesium.VelocityOrientationProperty(position),

        //Load the Cesium plane model to represent the entity
        model : {
            uri : '../data/models/CesiumAir/Cesium_Air.gltf',
            minimumPixelSize : 64
        },

        //Show the path as a pink line sampled in 1 second increments.
        path : {
            resolution : 1,
            material : new Cesium.PolylineGlowMaterialProperty({
                glowPower : 0.1,
                color : Cesium.Color.YELLOW
            }),
            width : 10
        }
    });

    //Add button to view the path from the top down
    Sandcastle.addDefaultToolbarButton('View Top Down', function() {
        viewer.trackedEntity = undefined;
        viewer.zoomTo(viewer.entities, new Cesium.HeadingPitchRange(0, Cesium.Math.toRadians(-90)));
    });

    //Add button to view the path from the side
    Sandcastle.addToolbarButton('View Side', function() {
        viewer.trackedEntity = undefined;
        viewer.zoomTo(viewer.entities, new Cesium.HeadingPitchRange(Cesium.Math.toRadians(-90), Cesium.Math.toRadians(-15), 7500));
    });

    //Add button to track the entity as it moves
    Sandcastle.addToolbarButton('View Aircraft', function() {
        viewer.trackedEntity = entity;
    });

    //Add a combo box for selecting each interpolation mode.
    Sandcastle.addToolbarMenu([{
        text : 'Interpolation: Linear Approximation',
        onselect : function() {
            entity.position.setInterpolationOptions({
                interpolationDegree : 1,
                interpolationAlgorithm : Cesium.LinearApproximation
            });
        }
    }, {
        text : 'Interpolation: Lagrange Polynomial Approximation',
        onselect : function() {
            entity.position.setInterpolationOptions({
                interpolationDegree : 5,
                interpolationAlgorithm : Cesium.LagrangePolynomialApproximation
            });
        }
    }, {
        text : 'Interpolation: Hermite Polynomial Approximation',
        onselect : function() {
            entity.position.setInterpolationOptions({
                interpolationDegree : 2,
                interpolationAlgorithm : Cesium.HermitePolynomialApproximation
            });
        }
    }], 'interpolationMenu');

</script>
</body>
</html>